If you already bought it , it is a nice build.
If you haven't, I would change the power supply to something decent
Good brands are Antec, Corsair(Not CX, CS series), Coolermaster V series, Seasonic or XFX
For single gpu, 550-650w is fine, For SLI and crossfire 750W+.
i5 is fine for gaming but if you can afford i7 it is fine.
the power supply is Corsair and i am looking at an i7 for its hyperthreading, although i was gonna go for the fx-9590 black edition but the i7 seemed to fit better for my needs. im also considering changing the power supply for somthing bigger and get gtx 770 Sli but if i can afford it i shall go sli with the gtx 780 ti